Milk at retailers with limited sales is more likely to get spoiled.

Though people require milk daily, it is not possible for everyone to collect the milk in the morning, especially if they use the internet.
So some citizens are purchasing from retail stores.
Though these retail stores have freezers and coolers, if the sales are less, the milk will remain for a few days.
The customer may keep the milk in the refrigerator for some time, and then when the milk is heated, it immediately gets spoiled. So all the milk costing Rs 25 is effectively wasted.